string="他问,你知道cba是什么单词的缩写么?"
print(string)
print('1.删除空格')
print('2.英文标点替换')
print('3.首字母大写')
print('4.退出')
while True:
    option=input("请输入功能选项:\n")
    if option=='-1':
        string =string.replace('','')
        print(string)
    elif option=='2':
        for i in string :
            if i==',':
                string =string.replace(',',',')
            elif i=='.':
                string =string.replace(',','。')
            elif i=='?':
                string=string.replace('?','?')
            elif i=='?':
                string =string.replace("'","'")
                string=string
                print(string)
                if option=='3':
                    string=string.upper()
                print(string)
                if option =='4':
                    break





